Vulnerability in Openclaw Matrix
CVE-2026-100541
OpenClaw's Matrix integration (npm package @openclaw/matrix) versions >= 2026.2.2 and < 2026.8.1 lowercase complete Matrix user IDs — including historical localparts and the case-sensitive server-name portion — when deriving the OpenClaw authorization identity. As a result, distinct authenticated Matrix accounts can normalize to the same authorization identity. A Matrix participant controlling a colliding account identifier (a protocol-valid identifier that differs from the configured one only by characters OpenClaw case/Unicode folds; display-name matching is not required) can inherit allowlist, owner-command, exec-approval, or plugin-approval authority configured for another account. The issue is fixed in 2026.8.1.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.003 (23.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 23rd percentile — 23.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000
Affected products
Weakness classification (CWE)
References
- GitHub Security Advisory (GHSA-hgv5-f2r3-6v9r) (vendor-advisory)
- VulnCheck Advisory: OpenClaw Matrix before 2026.8.1 Authorization Bypass via Case Folding (third-party-advisory)
Frequently asked questions
- What is CVE-2026-100541?
- CVE-2026-100541 is a high-severity vulnerability in Openclaw Matrix, classified under Improper Handling of Case Sensitivity. CVSS score: 7.5/10. Published 2026-09-26.
- How severe is CVE-2026-100541?
- High severity. CVSS v3 base score is 7.5 out of 10.